Some factors like smoking and age can contribute to the likelihood a woman might miscarry but doctors usually can't pinpoint a reason.

一些因素，比如吸烟和年龄大是女性流产可能的原因，但医生们通常并不能查明原因所在。

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Some factors, like smoking and age, can contribute to the likelihood a woman might miscarry, but doctors usually can't pinpoint a reason.

一些因素，比如吸烟和年龄大是女性流产可能的原因，但医生们通常并不能查明原因所在。

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Balancing the risks and benefits is different for every woman, and depends on factors such as genetic history, diet and lifestyle.

对于不同的女性来说，如何平衡风险和益处也因人而异，取决于诸如遗传史、饮食习惯和生活方式等诸多因素。

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Making the disparity appear the greatest, the White House uses a distorted snapshot to compare the earnings of the median full-time working man and woman, ignoring the many factors that we know influence how much someone earns.

FORBES: The Gender Pay Gap Got Worse, Not Better, In 2012--And It's Great For Women

He claims the CSA doesn't consider many factors, such as cases where the woman earned considerably more than her ex-partner.

BBC: NEWS | UK | 'I refuse to give CSA a penny'

The risk was further increased if the woman's baby had restricted growth or died in the womb, or if the woman had pre-existing risk factors for cardiovascular disease, such as tobacco smoking.

BBC: NEWS | Health | Placenta clues to heart disease